Hmm, perhaps this bug's package assignment needs tweaking: are most
people here talking about the radeon driver, or about fglrx?

I've just managed to work around / fix my own fglrx lag by reverting the
fix for this bug:

https://launchpad.net/ubuntu/+bug/254468
MASTER: momentary video garbage upon drawing new objects 

I had to manually dig around to find the "don't backfill" patch that was
dropped, and re-patch my X server.  So, it seems something in that piece
of code is horribly slow on fglrx.  This also would explain why the
unimimize lag is directly proportional to the area of a window.

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[ubuntu 9.04 beta]slow unminimizing with ati card and desktop effects enabled
https://bugs.launchpad.net/bugs/351186
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